Linux (Debian-based) users may like this https://github.com/wimpysworld/deb-get

many packages set up their own apt repositories to update to newer versions in future the initial installation can be done using

apt-get

or

apt

itself, this one has github integration, which seems like only benefit...

Yes, also it saves the hassle of manually adding PPAs (which several Debian packages don't do on its own). It is basically Brew Cask replacement that didn't exist before. As for initial installation, several closed-source apps aren't available in official repos, not even as meta packages, so one still has to go through downloading the Deb and deal with dpkg first before sources.list is updated to handle future upgrades.

Handling ppas and stuff is something I'm too used to, perhaps that's why I don't see much benefit 😛